com.fasterxml.jackson.core.JsonParseException: Illegal unquoted character ((CTRL-CHAR, code 10))

[Gregg Freeman]

We're trying to parse this JSON received from a 3rd party:

{

"comments": 

"\\",

"foo": "bar"

}

However, Jackson (2.5.0) seem to throw the exception in the title.  Should Jackson be able to successfully parse this?

[Tatu Saloranta]

If content does indeed contain character 10 (Unicode), that is, linefeed, it is prohibited by JSON specification (should be escaped as \n), so the content should be fixed and parser is right to report it.

This is assuming content does have that; cut'n pasting JSON can not quite tell that, so you'd have to check it.

However it is possible to make parser more lenient by enabling `JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS` to let this violation be skipped and character included as-is during parsing.

So: caller should NOT send such unescaped characters, but you may want to temporarily enable those before sender has been fixed.

Hope this helps,

-+ Tatu +-

ps. Not too that version 2.5.0 is old and there are patch releases, so should at least upgrade to 2.5.5 -- I don't think there are bug fixes relevant to this use case but it's good habit to ensure latest patch is used before checking for bugs

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[Gregg Freeman]

Thank you very much for the response.  I looked through the defects and agree that I didn't see anything related to this.  The Feature setting you specified will help us out a ton.

Our environment is pretty "structured" for getting new releases, but we'll try to get the patch release.

Thanks again!